Last Summer the Copenhagen Philharmonic went viral with a flash mob at Copenhagen Central Station, Denmark’s largest train station.  Today they’re going viral again–this time with a flash performance on a Copenhagen Metro train.

A video of the Copenhagen Phil performance of Peer Gynt on the metro was uploaded to YouTube on May 3 and is spreading like wildfire, with over half a million views so far.

The video description on YouTube reports that “All music was performed and recorded in the metro.”  Pretty impressive, eh?  How amazing would it have been to ride the train that day and experience this flash mob in person?